The rubber outsole of rubber shoes needs to be in direct contact with the ground, and the rubber used is required to have good wear resistance, flex resistance, elasticity and certain strength, and is generally processed with natural rubber, styrene-butadiene rubber and butadiene rubber as the main raw materials. As the most common reclaimed rubber variety on the market, tire reclaimed rubber has the basic performance characteristics of rubber, and the price is low, so it can be mixed into the rubber shoe outsole formula in an appropriate proportion to effectively reduce costs; Selecting the appropriate tire reclaimed rubber varieties and reasonably designing the formula can further optimize the comprehensive index and practical life of the rubber shoe outsole containing tire reclaimed rubber.
1. Key points for the selection of tire reclaimed rubber for rubber shoe outsole
There are many kinds of tire reclaimed rubber on the market, and the following aspects can be considered when choosing tire reclaimed rubber for rubber shoe outsole.
(1) Mechanical strength: The outsole of the rubber shoe needs to have a certain tensile strength, tear strength, hardness, etc., to provide it with support, durability, resistance to external force wear, and ensure the flexibility and comfort of the sole. When choosing tire reclaimed rubber for rubber shoe outsoles, it is necessary to consider whether the tensile strength, elongation at break, hardness and other indicators of reclaimed rubber can meet the physical property requirements of the sole.
(2) Mobility: The use of tire reclaimed rubber to produce rubber shoe outsoles, especially rubber shoes with white uppers, must choose tire reclaimed rubber that does not migrate, to avoid yellowing, discoloration and other problems in the production and use process.
(3) Environmentally friendly and odorless: choose environmentally friendly tire reclaimed rubber and odorless tire reclaimed rubber that can provide relevant test reports to protect human health.
2. Key points for the selection of rubber shoe outsole compounding agent for tire reclaimed rubber production
When tire reclaimed rubber and original rubber are used together to produce rubber shoe outsoles, sulfur-accelerator system is mostly used, and accelerator M, accelerator D, accelerator CZ, etc. are combined with sulfur; Reinforcing filler E4LYY321 carbon black N330 can be used to reinforce, clay and light calcium filling, which can improve the physical properties of the rubber compound and reduce costs; The plasticizer is paraffin, heavy oil, etc., to improve the processing performance of the rubber compound; Antioxidant A, antioxidant D, etc., are used to improve the aging resistance of the outsole of rubber shoes.
3. Mixed with tire reclaimed rubber to produce black rubber shoe outsole vulcanization formula
50 parts of natural rubber, 15 parts of styrene-butadiene rubber, 35 parts of butadiene rubber, 40 parts of tire reclaimed rubber, 5 parts of zinc oxide, 2.5 parts of stearic acid, 1 part of antioxidant D, 70 parts of carbon black N330, 15 parts of clay, 5 parts of light calcium, 25 parts of engine oil, 2 parts of calcium-based grease, 15 parts of RX-80 resin, 0.65 parts of accelerator D, 2 parts of accelerator DM, 1.25 parts of accelerator M, 2.2 parts of sulfur; Total: 286.6 copies.
In actual production, the mixing ratio of tire reclaimed rubber in the outsole of black rubber shoes is determined by the physical properties of reclaimed rubber and the performance requirements of the sole. Appropriate adjustment of the formula can appropriately increase the amount of reclaimed rubber and further improve the economic benefits of manufacturers.
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